EP1115663B1 - Verfahren zur entwässerung komplexer schlämme - Google Patents

Verfahren zur entwässerung komplexer schlämme Download PDF

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Publication number
EP1115663B1
EP1115663B1 EP99932065A EP99932065A EP1115663B1 EP 1115663 B1 EP1115663 B1 EP 1115663B1 EP 99932065 A EP99932065 A EP 99932065A EP 99932065 A EP99932065 A EP 99932065A EP 1115663 B1 EP1115663 B1 EP 1115663B1
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EP
European Patent Office
Prior art keywords
acrylamide
copolymers
colloidal
flocculant
sludge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99932065A
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English (en)
French (fr)
Other versions
EP1115663A1 (de
EP1115663A4 (de
Inventor
Anthony G. Sommese
Jitendra Shah
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ChampionX LLC
Original Assignee
Nalco Chemical Co
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Filing date
Publication date
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Publication of EP1115663A1 publication Critical patent/EP1115663A1/de
Publication of EP1115663A4 publication Critical patent/EP1115663A4/de
Application granted granted Critical
Publication of EP1115663B1 publication Critical patent/EP1115663B1/de
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step

Definitions

  • the present invention relates to the dewatering of sludges derived from an autoheated thermophilic aerobic digestion system (ATAD).
  • ATAD autoheated thermophilic aerobic digestion system
  • Biosolids are a byproduct of waste water treatment which have been recognized as a valuable commodity. Before sludge can be returned into the natural cycle, an adequate treatment for stabilization and pathogen reduction is required. The United States Environmental Protection Agency has established standards for both goals. One highly effective technology for achieving a high degree of pathogen reduction is autothermal thermophilic aerobic digestion ("ATAD").
  • ATD autothermal thermophilic aerobic digestion
  • the ATAD process is an aerobic digestion process that operates in the thermophilic temperature range (40-80°) without supplemental heating.
  • the thermophilic bacteria flourish at these elevated temperatures and have a much higher metabolism rate. This results in a faster rate of soluble organic destruction, when compared to conventional aerobic digestion. As these bacteria destroy the volatile organics, they release energy in the form of heat. The soluble organics are reduced to their lowest components: CO 2 and H 2 O. Additionally, the high temperature of the system is effective in destroying pathogens. This process has the additional advantage of reducing the biomass volume. Up to 45% of the solids are destroyed after one week in an ATAD system. This degree of solids reduction is possible in an anaerobic digester after three weeks or in a conventional aerobic digester after two months.
  • US-A-5730864 discloses a method of treating an untreated flow of liquid. A coagulant, granular material and flocculent are used wherein an increased settling speed is achieved.
  • JP6114209 discloses a method which includes addition of an inorganic flocculation aid to adjust the pH of a waste water to a point where the water can be released to the environment.
  • an inorganic flocculation aid to adjust the pH of a waste water to a point where the water can be released to the environment.
  • a flocculation aid adsorbents and sedimentation aids are disclosed as being useful in this process.
  • the present invention uniquely provides a method for dewatering ATAD sludges.
  • the method incorporates a three-component treatment for the dewatering of such sludges. Initially, the sludge is dosed with an inorganic coagulant. Then, the sludge-inorganic mixture is dosed with a microparticle component. Lastly, the resulting mixture is dosed with a high molecular weight flocculant.
  • the inorganic coagulant component is utilized to obtain broad floc formation. Suitable types of inorganic coagulants include salts of aluminum, iron and zinc.
  • Suitable types of inorganic coagulants include salts of aluminum, iron and zinc.
  • the inventors of the present invention have uniquely recognized an increase in the amount of free drainage achievable with the present application.
  • This microparticle component can be either organic or colloidal in nature.
  • the resulting mixture is dosed with a high molecular weight flocculant.
  • This flocculant can be anionic, cationic or non-ionic in nature.
  • the high molecular weight flocculant is a polymer having a molecular weight greater than 5 million amu.
  • An advantage of the present invention is the ability to produce strong dewaterable floc in difficult sludges that can readily release water and can withstand the shear of mechanical dewatering.
  • Another advantage of the present invention is the ability to cost effectively dewater difficult sludges by producing strong floc formation at dosages lower than those often required in current flocculant programs.
  • the present invention provides an improved method for dewatering difficult sludges derived from the ATAD digestion process.
  • This process is unique in that it uses elevated temperatures and thermophilic bacteria to degrade the waste. Degradation is so efficient that one is left with very small particles, which need to be dewatered before land filling. These small particles have a large surface area and therefore require high dosages of polymer to overcome the physical forces, flocculate together and settle.
  • the inventors have uniquely discovered that the method of the present invention allows for the cost effective dewatering of such sludges.
  • the method of the present invention includes a three-component treatment according to claim 1. Initially, the sludges derived from an ATAD are dosed with an inorganic coagulant.
  • the inorganic coagulant is utilized to form large networks that act to carry or sweep suspended particles with the network.
  • the inorganic coagulant is used to add body to the extremely small particles and initiates the flocculation of such particles.
  • Suitable types of inorganic coagulants that can be used in the method of the present invention include known metal salts, such as salts of aluminum, iron and zinc. These salts are effective because they build structure when added to water.
  • suitable chemicals that can be used for the inorganic coagulant include, for example, FeCl 3 , FeSO 4 , AlCl 3 , Alum, Al 2 Cl x (H 2 O) y , ZnCl 2 , ZnCl 4 and polyaluminum chloride.
  • a microparticle component is added to the sludge-inorganic mixture. This microparticle component can either be organic or colloidal in nature.
  • microparticle component increases the amount of free drainage.
  • the microparticle component of the present invention promotes this objective.
  • the microparticle component can be an organic polymer.
  • Suitable organic polymers include, for example, polyacrylates, acrylamide/sodium acrylate (AcAm/NaAc) copolymers, polyacrylamidopropylaulfonic acid (poly AMPS), acrylamide/acrylamidopropylsulfonic acid (AcAm/AMPS) copolymers and terpolmers containing acrylamide/sodium acrylate/acrylamidopropylsulfonic acid (AcAm/NaAc/AMPS).
  • Suitable organic polymers have a molecular weight ranging from 10,000 to 500,000. In an embodiment, the molecular weight of the organic polymer is less than 1 million amu (atomic mass units).
  • the microparticle component can be a colloidal inorganic material.
  • suitable types of inorganic materials include colloidal silica (varying particle sizes), colloidal zinc or aluminum, colloidal borosilicate, various clays (betonites, hectorites, smectites), colloidal aluminas and zincs and alum.
  • a high molecular weight flocculant is added to the resulting mixture.
  • the high molecular weight flocculant is selected based on the characteristics of the sludge, namely the charge demand of the sludge. For this reason, the flocculant can be either anionic, cationic or non-ionic in nature.
  • This final component to the treatment system acts to bring all of the particles together in the form of flocs.
  • the flocculant of the present invention can possess a positive, neutral or negative charge based on the characteristics of the particular sludge being dewatered.
  • Suitable types of positively charged monomers include, for example, dimethylaminoethyl acrylate methyl chloride salt (DMAEA.MCQ), dimethylaminoethylacrylate methyl sulfate salt (DMAEA.MSQ), dimethylaminoethylmethacrylate methyl chloride salt (DMAEM.MCQ), dimethylaminoethylacrylate benzyl chloride salt (DMAEA.BCQ), dimethylaminoethylmethacrylate methyl sulfate salt (DMAEM.MSQ), acrylamidopropyltrimethylammonium chloride (APTAC), methacrylamidopropyltrimethylammonium chloride (MAPTAC), diallyldimethylammonium chloride (DADMAC) and 2- and 4-vinylpyridine.
  • suitable types of negatively charged monomers include, for example, sodium acrylate (NaAc), sodium acrylamidopropylsulfonic acid (NaAMPS) and sodium methacrylate (NaMAc).
  • suitable types of neutral monomers include, for example, acrylamide (AcAm), methacrylamide (MAcAm), all of the esters and amides of acrylic and methacrylic acid, vinyl pyrrolidone and N-vinylformamide.
  • the flocculant can be a homopolymer of any of these monomers, but more preferably the flocculant is a copolymer with acrylamide.
  • the flocculant of the present invention is preferably a high molecular weight flocculant polymer.
  • Suitable flocculant polymers have a molecular weight ranging from 1 million to 25 million amu. In an embodiment, the molecular weight of the organic polymer is greater than 5 million amu.
  • the flocculants utilized in the present invention will be cationic in nature.
  • the flocculant is chosen based on the charge demand of the sludge. The determination of charge is done through the testing of a variety of flocculants and observing which flocculants produce the best floc and release the most water.
  • the standard mode of testing utilized in the following experimental examples was the standard free drainage test.
  • 200 ml of sludge was added to a 500 ml graduated cylinder. Polymer was then added to the sludge as was dilution water to make the volume consistent.
  • the cylinder was then capped and inverted a number of times until flocs began to form and water appeared to break away from the flocculated sludge.
  • the sludge was then poured over a piece of fabric and the volume of water was collected. The volume of water was recorded at 5, 10 and 15 seconds. This simulates the free drainage zone on the belt press.
  • the cake stability was examined to see if more water could be squeezed from same. Essentially, a positive result was obtained if good floc formation was achieved, a large volume of water was released and drained in the shortest period of time and more water is obtainable from squeezing the cake.
  • Example 1 An ATAD sludge from a Southeastern Municipal facility.
  • the sludge was treated with conventional high charged cationic flocculants, like Nalco® 7194 Plus and Nalco® 7139 Plus, at various dosages. Also added to this sludge, before polymer addition, was 5000 ppm of Alum. The drainage results are contained in Table 1. Poor free drainage was observed. Table 1. Dosage (ppm) Free Drainage N-7194 Plus (ml water/10 sec) N-7139 Plus 350 22 15 450 30 20 550 28 25
  • the sludge was treated with conventional high charged anionic flocculants, Nalco® 9878 and 95LP073, at various dosages. Also added to this sludge, before polymer addition, was enough aluminum chlorohydrate to bring the sludge pH to 5.5. The drainage results are contained in Table 4. Good free drainage was observed only at high polymer dosages. Table 4. Free Drainage (ml water/10 sec) Dosage (ppm) Nalco® 9878 Nalco® 95LP073 250 22 500 64 50 750 76 50 1000 79 50 1250 83
  • Table 5 summarizes the results obtained using an inorganic microparticle. Keeping the microparticle dosage constant, the amount of flocculant was varied and the amount of free drainage recorded.
  • the microparticle for Table 2 was colloidal silica, Nalco® 1115. Table 5. Nalco® -9878 Free Drainage (ml water/10 sec) Dosage (ppm) Nalco® 1115@50 ppm 250 32 500 99 750 95 1000 77
  • Table 6 summarizes the results obtained using an organic microparticle, Nalco® 8677. Keeping the flocculant constant, the amount of organic microparticle was varied. The free drainage was then recorded. A significant increase in free drainage was observed with the microparticle treatment. Table 6. Nalco® 95LP073 Free Drainage (ml water/10 sec) Dosage (ppm) Nalco® 8677@500 ppm 500 66 750 65 1000 64

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Claims (7)

  1. Verfahren zum Entwässern eines aus einem autothermen, thermophilen, aeroben Aufschlusssystem gewonnenen Schlamms, wobei der Schlamm kleine Teilchen enthält, mit den folgenden Schritten:
    Dosieren eines anorganischen Koagulierungsmittels in den Schlamm zur Bildung einer ersten Mischung;
    Dosieren eines Mikroteilchens in die erste Mischung zur Bildung einer zweiten Mischung, wobei das Mikroteilchen aus der Gruppe ausgewählt ist, die aus einem organischen Polymer, das aus der Gruppe ausgewählt ist, die aus Polyacrylaten, Poly(meth)acrylaten, Copolymeren von Acrylamid/Natriumacrylat, Copolymeren von Acrylamid/Natrium(meth)acrylat, Copolymeren von Acrylamid/Acrylamidpropylsulfonsäure und Terpolymeren von Acrylamid/ Acrylamidpropylsulfonsäure/Natriumacrylat besteht, und aus einem kolloidalen anorganischen Material besteht, das aus der Gruppe ausgewählt ist, die aus kolloidalem Siliciumdioxid; kolloidalem Zink; kolloidalem Aluminuium; kolloidalem Borsilicat, Bentoniten, Hectoriten, Fettonen, kolloidalen Aluminiumoxiden; und kolloidalen Zinken besteht;
    Dosieren eines Flockungsmittels in die zweite Mischung zur Bildung einer dritten Mischung, und
    Entwässern der dritten Mischung.
  2. Verfahren nach Anspruch 1, wobei das anorganische Koagulierungsmittel aus der Gruppe ausgewählt ist, die aus FeCl3, FeSO4, AlCl3, Alaun, Al2Clx(H2O)y, ZnCl2, ZnCl4 und Polyaluminiumchorid besteht.
  3. Verfahren nach Anspruch 1, wobei das Mikroteilchen ein organisches Polymer mit einem Molekulargewicht von weniger als 1 Million Atommasseneinheiten ist.
  4. Verfahren nach Anspruch 1, wobei das Flockungsmittel aus der Gruppe kationisch geladener Flockungsmittel ausgewählt ist, die aus Poly(DMAEM.MCQ), Poly(DMAEA.MCQ), Copolymeren von Acrylamid/DMAEA.MCQ, Copolymeren von Acrylamid/DMAEM.MCQ, Copolymeren von Acrylamid/APTAC, Copolymeren von Acrylamid/MAPTAC, Copolymeren von Acrylamid/DADMAC, Terpolymeren von Acrylamid/DADMAC/DMAEA.MCQ, Terpolymeren von AcAm/DMAEA.BCQ/DMAEA.MCQ und Copolymeren von Vinylamin/Vinylformamid besteht.
  5. Verfahren nach Anspruch 1, wobei das polymere Flockungsmittel aus der Gruppe ausgewählt ist, die aus nicht geladenen Flockungsmitteln besteht, die aus Polyacrylamiden, Polyvinylpyrrolidon, Polyvinylformamiden und Polyacrylsäure bestehen.
  6. Verfahren nach Anspruch 1, wobei das Flockungsmittel ein Molekulargewicht von mehr als 1 Million Atommasseneinheiten aufweist.
  7. Verfahren nach Anspruch 1, wobei das Flockungsmittel aus der Gruppe von anionisch geladenen Flockungsmitteln ausgewählt ist, die aus Polyacrylaten, Poly(meth)acrylaten, Copolymeren von Acrylamid/Natriumacrylat, Copolymeren von Acrylamid/Natrium(meth)acrylat, Copolymeren von Acrylamid/Acrylamidpropylsulfonsäure und Terpolymeren von Acrylamid/ Acrylamidpropylsulfonsäure/Natriumacrylat besteht.
EP99932065A 1998-09-18 1999-06-29 Verfahren zur entwässerung komplexer schlämme Expired - Lifetime EP1115663B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US156820 1988-02-17
US09/156,820 US6083404A (en) 1998-09-18 1998-09-18 Method of dewatering difficult sludges
PCT/US1999/014750 WO2000017112A1 (en) 1998-09-18 1999-06-29 Method of dewatering difficult sludges

Publications (3)

Publication Number Publication Date
EP1115663A1 EP1115663A1 (de) 2001-07-18
EP1115663A4 EP1115663A4 (de) 2003-08-13
EP1115663B1 true EP1115663B1 (de) 2006-09-20

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EP99932065A Expired - Lifetime EP1115663B1 (de) 1998-09-18 1999-06-29 Verfahren zur entwässerung komplexer schlämme

Country Status (15)

Country Link
US (1) US6083404A (de)
EP (1) EP1115663B1 (de)
JP (1) JP2002526253A (de)
AR (1) AR020473A1 (de)
AT (1) ATE340148T1 (de)
AU (1) AU4845799A (de)
CA (1) CA2341895C (de)
DE (1) DE69933300T2 (de)
DK (1) DK1115663T3 (de)
ES (1) ES2273503T3 (de)
NO (1) NO20011367L (de)
NZ (1) NZ510317A (de)
PT (1) PT1115663E (de)
TW (1) TW509663B (de)
WO (1) WO2000017112A1 (de)

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CN104692612A (zh) * 2015-03-18 2015-06-10 浙江埃柯赛环境科技股份有限公司 造纸污泥脱水复合絮凝剂

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US7461466B2 (en) * 2004-06-14 2008-12-09 Lehigh Cement Company Method and apparatus for drying wet bio-solids using excess heat from a cement clinker cooler
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JP2011120328A (ja) * 2009-12-01 2011-06-16 Yaskawa Electric Corp 永久磁石形モータ用のロータ、永久磁石形モータ及びこれらの製造方法
US8764974B2 (en) * 2010-04-16 2014-07-01 Nalco Company Processing aids to improve the bitumen recovery and froth quality in oil sands extraction processes
NZ609491A (en) 2010-10-29 2015-01-30 Buckman Lab Int Inc Papermaking and products made thereby with ionic crosslinked polymeric microparticle
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CN104692612B (zh) * 2015-03-18 2016-06-01 浙江埃柯赛环境科技股份有限公司 造纸污泥脱水复合絮凝剂

Also Published As

Publication number Publication date
ES2273503T3 (es) 2007-05-01
DK1115663T3 (da) 2007-01-29
NO20011367L (no) 2001-05-09
CA2341895A1 (en) 2000-03-30
EP1115663A1 (de) 2001-07-18
EP1115663A4 (de) 2003-08-13
US6083404A (en) 2000-07-04
JP2002526253A (ja) 2002-08-20
PT1115663E (pt) 2007-01-31
DE69933300T2 (de) 2007-01-04
DE69933300D1 (de) 2006-11-02
NZ510317A (en) 2003-12-19
AR020473A1 (es) 2002-05-15
AU4845799A (en) 2000-04-10
WO2000017112A1 (en) 2000-03-30
TW509663B (en) 2002-11-11
NO20011367D0 (no) 2001-03-16
ATE340148T1 (de) 2006-10-15
CA2341895C (en) 2008-04-29

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